D149522 introduced target features to LinkGraph. However, to avoid a
public dependency on MC, the features were stored in a std::vector
instead of using SubtargetFeatures directly.
Since SubtargetFeatures was moved from MC to TargetParser (D150549), we
can now use it directly to store the features. This patch implements
that and removes the (private) dependency on MC.
Reviewed By: lhames
Differential Revision: https://reviews.llvm.org/D153749
This patch adds SubtargetFeatures to LinkGraph. Similar to Triple, some
targets might use this information while linking.
One example, and the reason this patch was written, is linker relaxation
on RISC-V: different relaxations are possible depending on if the C
extension is enabled.
Note that the features are stored as `std::vector<std::string>` to prevent a
public dependency on MC. There is still a private dependency to be able to
convert SubtargetFeatures to a vector.
Reviewed By: lhames
Differential Revision: https://reviews.llvm.org/D149522
These values are moved into the base class constructors, so the `const` doesn't make any sense. Turns out, I accidentally introduced it myself with 2ed91da0f1f3 and since than it spread by copy/paste.
This commit adds support for PLT based relocations. Specifically -
1. It adds logic to create a `PLTTableManager` in the `buildTables_ELF_i386`
function, which is called as part of the post-prune JITLink passes. The `PLTTableManager`
handles creating pointer jump stubs and related GOT entries for position independent
code.
2. It also adds a pre-fixup pass to optimize away PLT based calls in position independent
code, when possible.
Reviewed By: lhames
Differential Revision: https://reviews.llvm.org/D142846
The i386/ELF JITLink backend was not correctly handling the GOTPC relocation
by skipping the in-built addend, which was manifesting itself in the form of
a segmentation fault in the `LF_external_to_absolute_conversion.s` test. This
CR has fixed that issue.
Reviewed By: lhames
Differential Revision: https://reviews.llvm.org/D141746
This commit adds support for 32 bit absolute and pc relative relocations in
ELF/i386 objects, along with simple regression tests.
Reviewed By: sgraenitz, lhames
Differential Revision: https://reviews.llvm.org/D135523
I (lhames) accidentally pushed 5f300397c6ae8fa7ca3547ec2b7a3cd844f3ed59 on
Kshitij Jain's behalf without updating the patch author first (my apologies
Kshitij!).
Re-applying with correct authorship.
https://reviews.llvm.org/D131347
